Murata adds functionality to simsurfing design support. While dcdc conversion circuitry has matured to the point. Therefore, based on this result, we need an inductor with an itemp of 1. Inductor design magnetics inductor design tool is an aid to assist design engineers in selecting the optimum powder core mpp, high flux, kool m, xflux, kool m max, and 75series for inductor applications, specifically switchmode power supply smps output filters, also known as dc inductors. As shown in the figure below, there are two inductors, i. The software will change dc resistance and copper losses accordingly. All about circuits is one of the largest online electrical engineering communities in the world with over 300k engineers, who collaborate every day to innovate, design, and create. Micrometals inductor design tool micrometals arnold. Choosing inductors and capacitors for dcdc converters. We can enter micro henry, ohms, amperes, core shape, winding type, frequency, voltage, temperature and more settings. The litzopt program optimizes litz wire stranding design to minimize the cost or power loss. This page deals purely with inductors or transformers which are intended to store energy or act as dc chokes. If there is no dc flux in the core, the design calculations are straightforward.
One of the most common usage of inductor is in dcdc conversion. Design inductor having a given inductance l, which carries worstcase. The program accepts user defined design requirements in terms of required inductance, dc resistance, dc bias current and applied ac voltage. As this name implies, most of the current flowing through the inductor is dc, with some amount of ac ripple current noted as idelta included as well figure 1. Iron alloys and ferrites provide greater flexibility in the design of high frequency power inductors, because the air gap can be adjusted to any desired length, and because the relative permeability is high, even at high, dc flux density. Analysis and design of coupled inductors for twophase. H max at 0 amps dc 25% saturation max 1 % ripple current determine importance of the following design. A dcdc boost converter operates based on the principles of the inductor that provides the boost for the circuit. Magnetics inductor design software is an aid to assist design engineers in selecting the optimum powder core for inductor applications, specifically in switchmode power supply smps output filters, also known as dc inductors. This consists of design process of buck and boost converters, basic theory and example designs using ni multisim 12. The micrometals inductor design calculator allows users to log in and select from two different inductor applications. Calculate and find the best inductor for your switcher topology. The inductor design software allows engineers to choose from several topologies like power factor correction or ac inductor, collects all the pertinent electrical, thermal and mechanical. Magnetics designer is a standalone software program for windows that designs all types of layer and sectorsplit bobbin wound transformers and inductors, and generates a corresponding spice model.
Selecting the best inductor for a dcdc converter rf design. Beijing institute of technology, 1995 a thesis submitted in partial fulfillment of the requirements for. Should we choose two individual inductors or two windings on a single core inductor for the sepic design. There are quite a few software packages and services to choose from. Selecting the best inductor for your dcdc converter leonard crane coilcraft abstract. A single regulator system can produce more than one separate dc output line by using a number of secondary windings.
The following approach can be chosen as a rough calculation. The current load for power inductors can be calculated very accurately in terms of dc current load and ripple current load core losses using the manufacturers simulation software. Selecting the best inductor for your dcdc converter. This field allow to modify the number of strands used to make the turns. Magnetics designer software makes transformer and inductor design easy magnetics designer is a standalone software program for windows that designs all types of layer and sectorsplit bobbin wound transformers and inductors, and generates a corresponding spice model. Inductor design in switching regulators better efficiency, reduced size, and lower costs have combined to make the switching regulator a viable method for converting unfiltered dc input voltages. I have chosen to use the lm2596 based buck converter, where an inductor is a vital component in the design. Planar magnetics design for lowvoltage dcdc converters. Improving the efficiency of dcdc converters by selecting. Use of these cores may result in an inductor design not optimized for size and weight. Nagaokakyo, kyoto prefecture, japan, august 29, 2018 nagaokakyo, kyoto prefecture, japan, august 29, 2018 murata today announced that it has integrated a dcdc converter design inductorcapacitor. By len crane, director of technical marketing coilcraft, inc. The inductor design software allows engineers to choose from several topologies like power factor.
Magnetics inductor design tool is an aid to assist design engineers in. Inductor voltages during the on and off times of the switch for ripple current calculation of dc inductors rms input and dc output voltages for ripple current calculation of pfc. Based on your application needs, you can now make informed decisions when selecting dcdc regulators, their switching frequency, amount of required board space for heatsinking, and also. Magnetics designer software makes transformer and inductor design. Inductor current ratings the current load for power inductors can be calculated very accurately in terms of dc current load and ripple current load core losses using the manufacturers simulation software. Typically, the core loss can be ignored, and the design is driven by the copper loss. Selecting coupled inductors for sepic applications selecting inductors to drive leds.
Software is also readily available to facilitate these designs1. The apparent power, pt, of an inductor is the va of the. Coupled inductor design optimization for fastresponse lowvoltage dcdc converters jieli li c. Some are standalone software you install on your pc and others run on a website usually a companys. This program will automatically calculate and display. Improving the efficiency of dcdc converters by selecting an appropriate inductor current author.
Choke design, high powerharmonic filter design, power factor harmonic filter design, input inductor design, dc link reactor design, dc link filter. Inductor performance can be described by a relatively few numbers. Slva157 4 choosing inductors and capacitors for dcdc converters figure 5. You can easily design inductors using this application. Find the perfect coupled inductor for sepic, zeta, or other applications. However i ususally do the design by the air gap design software for frequescies blow 500khz. While dcdc conversion circuitry has matured to the point that there are cookbook design aids as well as software. Getting started design of an inductor for a buck converter. Dcdc stepdown buck converters tools and software include webench, evaluation modules, reference designs, and more. Inductor performance in high frequency dcdc converters determining inductor power losses. Magnetics builder design magnetic inductor and transformer tool. Magnetics inductor design tool now available acal bfi fr.
Software for magnetics design here we present some design software you can download or run online. Table 1 shows a typical data sheet excerpt for a surface mount power inductor intended for dcdc converters. Getting started design of an inductor for a buck converter after starting geckomagnetics, the tab start becomes active, as is illustrated in the figure above. Selecting coupled inductors for sepic applications. Singlephase dcdc converters, such as the one shown in fig. The calculator accepts the following user defined design requirements as inputs. Magnetic builder magnetic design software, inductor and transformer design tool poweresim is a free webbased software providing power supply smps design, transformer design, magnetic design, loss. Magnetic builder is a magnetic design software to design magnetic component, inductor,transformer, coil, with different ferrite or powder core material. The design of an ac inductor is quite similar to that of a transformer. Magnetic builder magnetic design software, inductor and. Designers simply need to input their criteria, including dc current, peak to. H max at 0 amps dc 25% saturation max 1 % ripple current determine importance of the following design considerations. Coupled inductor design optimization for fastresponse low. By using muratas design support software called the simsurfing dcdc converter design.
Coilcraft design support tools rf chip inductors, power. Sullivan found in ieee applied power electronics conference, mar. The design tool software requires users to enter a material selection, dc current, full load and number of stack cores to provide accurate magnetics part. Coilcraft design tools powerful web tools to help you find the best parts and optimize your designs. Design of a power factor boost inductor, commonly referred to as a pfc choke.
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